SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd33cfd8f47861b7d7a00c1a529334bb30fcf1784ded1c74ac9650d9b066abb85' 
  AND token = 'RKJYKvsbL8wZrOESsFrivDW/V7B1L5HTtvEvEylMIPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}